I have two Dual 2 Ohm(4 Ohm in series) MKII HST-18’s that Nick custom made for me. They have a little bit different cone and surround which helps them measure slightly flatter in ported boxes. Mostly lifts the small dip up above tuning. This wasn’t a specific custom job, just an option Nick offered. All other performance aspects remain the same. I have these in “Cyclops” style ported boxes and they perform amazingly. My room is very small and I don’t push these anywhere near their potential. No pets, non smoker.
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible.
T. E. Lawrence.